Chemistry:2012:CBSE:[All India]: Set-I
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Q1
How may the conductivity of an intrinsic semiconductor be increased?
Marks:1View AnswerAnswer:
The conductivity of an intrinsic semiconductor can be increased by increasing the temperature.
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Q2
Which is stronger reducing agent, SbH3 or BiH3, and why?
Marks:1View AnswerAnswer:
Sb and Bi both belong to same group. BiH3 is stronger reducing agent because the tendency to liberate hydrogen increases as we move down the period.
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Q3
Write the structure of the product obtained when glucose is oxidized with nitric acid.
Marks:1View AnswerAnswer:
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Q4
What happened when bromine attacks CH2=CH–CH2–CΞCH?
Marks:1View AnswerAnswer:
Bromine molecule attaches across C=C and the following compound is formed
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Q5
Define 'peptization'.
Marks:1View AnswerAnswer:
Peptization is the process of conversion of a precipitate into a colloidal sol by shaking it with the dispersion medium in the presence of an electrolyte. The electrolyte used in this reaction is known as a peptizing agent.
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Q6
How is copper extracted from a low grade ore of it?
Marks:1View AnswerAnswer:
Copper is extracted by hydrometallurgy from low grade ores.
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Q7
Write the IUPAC name of the following.
Marks:1View AnswerAnswer:
Pent-2-en-1-al
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Q8
Differentiate between disinfectants and antiseptics.
Marks:1View AnswerAnswer:
Antiseptics are applied to the living tissues such as wounds, cuts, ulcers, and diseased skin surfaces, while disinfectants are applied to inanimate objects such as floors, drainage system, instruments, etc.
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Q9
Explain the mechanism of acid catalysed hydration of an alkene to form corresponding alcohol.
Marks:2View AnswerAnswer:
Alkenes undergo direct hydration in the presence of mineral acids which act as catalysts. The addition of water to the double bond takes place in accordance with Markonikoff's rule.
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Q10
Complete the following chemical reaction equations:
Marks:2View AnswerAnswer:
